cilium/ebpf v0.8.0

release · Jan 21, 2022

We’re happy to announce our first release of 2022!

Breaking Changes

• Deprecations
  • Deprecate StructOpts and perf.IsClosed() by @ti-mo in https://github.com/cilium/ebpf/pull/547

• cmd/bpf2go: strip DWARF info by @lmb in https://github.com/cilium/ebpf/pull/481 DWARF info is now stripped from compiled BPF objects by default when using bpf2go, resulting in significant savings in object size. It can be re-enabled if desired.

• elf_reader: emit UnspecifiedPrograms into CollectionSpec by @ti-mo in https://github.com/cilium/ebpf/pull/529 Previously, ProgramSpecs were not emitted to CollectionSpec.Programs if their ELF section names were not recognized. This limitation has been lifted: programs that are explicitly assigned to an ELF section will now always appear in the CollectionSpec, though they will all be of type UnspecifiedProgram. The SectionName field was added to help the user determine program types manually.

• map: make Map.Extra field a pointer to a bytes.Reader by @ti-mo in https://github.com/cilium/ebpf/pull/546 A last-minute addition, no longer allocate an empty bytes.Reader for every Map, as this is generally only used when loading legacy programs with iproute2 map definitions. If you’re using this field, check for nil before accessing.

Features

• automatically generate syscall wrappers by @lmb in https://github.com/cilium/ebpf/pull/425
• asm: update eBPF built-in functions by @florianl in https://github.com/cilium/ebpf/pull/459
• program: add program type syscall by @florianl in https://github.com/cilium/ebpf/pull/458
• Add v5.14 to CI builds by @lmb in https://github.com/cilium/ebpf/pull/462
• Improve kernel 4.4.x compatibility by @nplanel in https://github.com/cilium/ebpf/pull/436
• Add BTFIDLink to support fentry/fexit/fmod_ret/tp_raw/lsm BPF programs by @mehrdadrad in https://github.com/cilium/ebpf/pull/460
• link/uprobe: support ref_ctr_offset by @mmat11 in https://github.com/cilium/ebpf/pull/463
• Allows user space to update/lookup map elements under bpf_spin_lock by @mehrdadrad in https://github.com/cilium/ebpf/pull/473
• Makefile: prefer podman for container engine by @syscll in https://github.com/cilium/ebpf/pull/480
• asm: add Instructions.SizeBytes() for convenience and readability by @ti-mo in https://github.com/cilium/ebpf/pull/492
• Link: add XDP support by @mehrdadrad in https://github.com/cilium/ebpf/pull/484
• link: add LoadPinnedLink by @lmb in https://github.com/cilium/ebpf/pull/491
• implement BPF_PROG_BIND_MAP by @florianl in https://github.com/cilium/ebpf/pull/485
• use clang 13 by @lmb in https://github.com/cilium/ebpf/pull/488
• Read LINUX_VERSION_CODE from vDSO ELF header instead of uname by @brycekahle in https://github.com/cilium/ebpf/pull/500
• cmd/bpf2go: infer llvm-strip suffix from clang binary by @lmb in https://github.com/cilium/ebpf/pull/504
• Add support for function pointers by @pippolo84 in https://github.com/cilium/ebpf/pull/499
• prog: update program types from libbpf by @mehrdadrad in https://github.com/cilium/ebpf/pull/496
• btf: rename FindType to TypeByName, add TypesByName and TypeByID methods by @ti-mo in https://github.com/cilium/ebpf/pull/503
• btf: support raw BTF in LoadSpecFromReader by @lmb in https://github.com/cilium/ebpf/pull/520
• cmd/bpf2go: allow to specify native target by @tklauser in https://github.com/cilium/ebpf/pull/526
• asm: Add Jump32 support by @arthurfabre in https://github.com/cilium/ebpf/pull/514
• link: expose link info with type-specific information by @mehrdadrad in https://github.com/cilium/ebpf/pull/509
• Adopt Go 1.18 fuzzing and fix btf crashes by @lmb in https://github.com/cilium/ebpf/pull/530
• elf_reader,btf: support multiple programs per ELF section by @ti-mo in https://github.com/cilium/ebpf/pull/508
• Eliminate binary.Read in instruction (un)marshaler by @ti-mo in https://github.com/cilium/ebpf/pull/532
• program: retrieve xlated Instructions from Program by @ti-mo in https://github.com/cilium/ebpf/pull/538
• Support attaching SocketFilter programs to raw sockets by @folbricht in https://github.com/cilium/ebpf/pull/540

Bug Fixes

• CI: add make clean before testdata rebuild by @ti-mo in https://github.com/cilium/ebpf/pull/450
• sys: avoid zero fd by @lmb in https://github.com/cilium/ebpf/pull/454
• run-tests: don’t require CI_MAX_KERNEL_VERSION to be set by @lmb in https://github.com/cilium/ebpf/pull/470
• features: fix HaveProgType(ebpf.Syscall) by @rgo3 in https://github.com/cilium/ebpf/pull/471
• elf: fix some typos in getProgType by @alxn in https://github.com/cilium/ebpf/pull/493
• CI: work around hung agents by @lmb in https://github.com/cilium/ebpf/pull/516
• link: switch tests from printk to vprintk symbol by @ti-mo in https://github.com/cilium/ebpf/pull/518
• map: allow empty ProgramArray to not be assigned by @lmb in https://github.com/cilium/ebpf/pull/513
• prog: don’t panic when prog load EPERMs with empty verifier log by @ti-mo in https://github.com/cilium/ebpf/pull/519
• map, prog: fix typo in MEMLOCK error string by @tklauser in https://github.com/cilium/ebpf/pull/527
• btf: only return exact matches from AnyTypesByName by @lmb in https://github.com/cilium/ebpf/pull/525
• Remove BTF type IDs on map creation if not supported by @chenhengqi in https://github.com/cilium/ebpf/pull/534
• rlimit: avoid lowering Max rlimit by @ti-mo in https://github.com/cilium/ebpf/pull/533
• linker: Allow calling into unimplemented forward function declarations by @ti-mo in https://github.com/cilium/ebpf/pull/544

Documentation

• cmd/bpf2go: move doc to README by @lmb in https://github.com/cilium/ebpf/pull/446

Examples

• reproducible builds for examples by @lmb in https://github.com/cilium/ebpf/pull/417
• examples: added cgroup_skb example by @mingleiw in https://github.com/cilium/ebpf/pull/465
• Add fentry example by @mehrdadrad in https://github.com/cilium/ebpf/pull/482
• examples: add $BPF_STRIP to bpf2go invocation by @lmb in https://github.com/cilium/ebpf/pull/498
• tidy up examples by @lmb in https://github.com/cilium/ebpf/pull/521

New Contributors

During this release cycle, we’ve welcomed the following new contributors:

• @nplanel made their first contribution in https://github.com/cilium/ebpf/pull/436
• @mingleiw made their first contribution in https://github.com/cilium/ebpf/pull/465
• @syscll made their first contribution in https://github.com/cilium/ebpf/pull/478
• @alxn made their first contribution in https://github.com/cilium/ebpf/pull/493
• @chenhengqi made their first contribution in https://github.com/cilium/ebpf/pull/534

Thanks to all contributors for your support!

Full Changelog: https://github.com/cilium/ebpf/compare/v0.7.0...v0.8.0

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